Pivotal mounting structures for vertical twin-wire papermaking machine

ABSTRACT

In a vertical twin-wire paper machine in which the wires may wrap around a common turning roll, the breast roll support rolls and associated deflectors for each of the opposed reaches of the two wires which converge to define the forming zone are supported on essentially unitary frame members mounted for pivotal movement toward and away from each other between operative positions and retracted positions for wire changing and replacement or other maintenance of the deflectors. The common turning roll is mounted on one of the unitary frame members by a bracket and can be located at the lower end of the frame member in machines wherein the wire convergence is downwardly or at the upper end of the frame member in machines wherein the wire convergence is upwardly.

Notbohm Nov. 13, 973

PIVOTAL MOUNTING STRUCTURES FOR VERTICAL TWIN-WIRE PAPERMAKING R25,3332/1963 Baxter 162/203 X MACHINE Primary Egaminer-S. Leon BashoreAssistant xaminer-Richard H. Tushin [75] Inventor: I\q'VflYlard C.Notbohm, Watertown, Atmmey-MarechaL Biebe], French & Bugg [73] Assignee:The Black Clawson Company, [57] ABSTRACT Hamllton, Ohio In a verticaltwin-wire paper machine in which the [22] Filed; Mar. 31, 1971 wires maywrap around a common turning roll, the breast roll support rolls andassociated deflectors for [21] p N05 129,852 each of the opposed reachesof the two wires which converge to define the forming zone are supportedon 52] U.S. c1 162/273, 162/200, 162/301 essentially unitary framemembers mmted PM)ll 511 1m. (:1. D2lf 1/00 movement Ward and away fmmeach Other between 58 1 Field of Search 162/273, 301, 303, Operativepsitins and retracted psiti9ns 162/203, 274, 200 changing andreplacement or other maintenance the deflectors. The common turmng rollis mounted [56] References cited on 08c pf thte (iirnittagly flramemetrinbfertshbyfa bracket 1nd can e ocae a e ower en 0 e rame mem erUNITED STATES PATENTS in machines wherein the wire convergence is downlgl z wardly or at the upper end of the frame member in 0t 0 m 3,597,3158/1971 Notbohm et a1 162/203 machmes wherem the convergence upwardly3,578,561 5/1971 McCarrick et al 162/203 X 11 Claims, 8 Drawing Figures92 88 3o 1 "T: l3 |2- ass x Q o 24 s\ Y Z Q, 55 11 1 11 6 (L t i 11/\3511 72 l|1|l 1" 1i 5ST h i :L'L: =6| 44 0 UNJI O 153 :1 i I -1|| O as82 40 no O I o 6? as 23 X\ 66 13 70 El 56 22 -v 1 58 (OD/L 1 I I/ 5O 5825 50 Patented Nov .13, 1973 4 Sheets-Sheet I IN VE/V TOR WILLARD C.NOTBOHM A TTOR/VEYS Patented Nov .13, 1973 3,772,145

4 Sheets-Sheet 2 Patented Nov .13, 1973 3,772,145

4 sheets-sheet 5 Patented Nov .13, 1973 3,112,145

4 Sheets-She et 4 machine that the wire reaches defining the formingzone be properly guided, and this requires accurate placement of theseveral deflectors or other guide means which support these wirereaches. It is also important that such guide means be capable ofretaining their proper positions under their working loads, andparticularly of resisting the sagging which is an increasing problem asthe width of such paper machines increases. This is a special problemwhen deflectors are used which are supported only at the ends of thepaper machine, since this requires that the deflector assemblies be ofrelatively heavy and rigid construction, thereby in turn increasingtheir requirements for space in the direction of wire travel and thusthe length of the forming zone itself. The present invention isparticularly directed to improvement of these conditions.

FIVOTAL MOUNTING STRUCTURES FOR VERTICAL TWIN-WIRE PAPERMAKING MACHINEREFERENCE TO COPENDING APPLICATIONS BACKGROUND OF THE INVENTION Theinvention relates to paper making machines generally of the type shownin Baxter U.S. Pat. No. Re. 25,333, and characterized by theincorporation of a pair of endless forming wires arranged to wrap acorresponding pair of horizontally spaced breast rolls in such manner asto provide a pair of opposed reaches which travel generally verticallyfrom the breast rolls in closely spaced converging relation to createthe zone wherein the paper sheet is formed. The invention also relatesto the similar vertical paper machines shown in Baxter et al U.S. Pat.No. 3,215,594 and characterized by the provision of multiple deflectorswhich support the traveling wires in the desired converging relationwherein they define the forming zone. The above copending applicationsrelate to improvements in vertical paper machines generally of the typeshown in the Baxter and Baxter et al patents which may be incorporatedin a vertical paper machine in accordance with the present invention.

Vertical paper machines of the type to which the It is especiallyimportant in a vertical two-wire paper SUMMARY OF THE INVENTION In atwin-wire paper machine in accordance with the present invention, therolls and the deflector assemblies or other guide means for supportingthe reaches of each wire which define the forming zone are mounted on anessentially unitary frame member or module supported for pivotalmovement toward and away from the complementary frame member for theguide means for the other wire. Each of these frame members is of strongand rigid construction, and the deflectors for the associated wire aremounted thereon by mountings which are in reinforced relation with thestructure of the frame members such that they are more than capable ofwithstanding all normal loads tending to cause deflection. Theindividual deflectors can therefore be relatively thin, and they can bearranged in as closely spaced relation as is needed to establish thedesired length and configuration of the forming zone.

The provision of pivotally mounted frame members has additionaladvantages especially when the arrangement is such that one frame membercan move to a substantially horizontal retracted position, which is alsothe preferred position for wire changing. With the wires removed, theworking surfaces of both sets of deflectors are exposed for ready accessfor adjustment, replacement or other maintenance purposes. Suchmaintenance operations are facilitated in accordance with the inventionby providing the individual deflector assemblies with mountingconnections which are easily accessible from the exposed working surfaceof the deflectors for removal or adjustment purposes.

These advantageous features of the invention are also important infacilitating maintenance of the proper configuration of the formingzone. Thus since the deflectors for each wire can be fixedly secured tothe associated frame member in the proper alignmern with each otherwhile the frame members are retracted, both sets of deflectors willmaintain these alignments when the frame members are returned to theiroperative positions. Additionally, these predetermined alignments aremaintained throughout a wire changing operation, because they are notdisturbed unless adjustment or replacement is required in order tochange the configuration of the forming zone, which is a servicing0peration readily performed in the course of wire changing.

It is a primary object of the present invention to provide a twin-wirepaper machine which will have the features and advantages outlinedabove. Additional objects and advantages will be apparent from thefollowing description, the accompanying drawings and the appendedclaims.

DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagrammatic view in sideelevation showing a vertical paper machine constructed in accordancewith the invention and with all of the parts in operative position;

FIG. 2 is a view similar to FIG. I but showing the positions of theparts during wire changing;

FIG. 3 illustrates somewhat diagrammatically the storage condition ofthe apparatus for changing the carrying wire in FIG. 2;

FIG. 4 is a perspective view of the frame member for carrying the breastroll and guide means for the carrying wire, the frame member being shownwith all guide means removed;

FIG. 5 is a view partly in elevation and partly broken in section on theline 55 of FIG. 6 illustrating details of the construction and mountingof one of the deflector assemblies;

FIG. 6 is a fragmentary plan view of the deflector assembly shown inFlG. and

FIGS. 7 and 8 are diagrammatic views illustrating the application of theinvention to other designs of vertical paper machine.

DESCREPTION OF THE PREFERRED EMBODIMENTS The vertical paper machineillustrated in FIGS. 12 is generally of the design shown in US. Pat. No.3,573,161 and it includes a pair of breast rolls l0 and 11 supported inhorizontally spaced relation. A pair of forming wires 12 and 13 arelooped around the respective breast rolls l0 and ii and are broughttogether partially around a single roll 15 mounted by a bracket orsupport means 15a in the position of a couch roll below and generally inline with the lefthand breast roll 10, but roll 15 is solid and istherefore more properly termed a turning roll for the wires 12-13, theterm wires" being used generically as including foraminous forming websof any suitable material. The remainder of the loop of the lefthand orbacking wire 12 is supported by a turning roll 16 and an adjustableguide roll 17. The righthand or conveying wire 13 is similarly supportedby a suction roll 28, a turning roll 2i, return rolls 22 and 23, anadjustable guide roll 24 and a tensioningrolLZS. The rolls It and 20,and preferably also the turning roll 21, are provided with adjustabledrive means (not shown) to cause the wires to travel downwardly from thebreast rolls til-l1 in desired speed relation, which is preferablyessentially synchronous.

The reaches of the wires 12 and 13 directly below the breast rolls l0and 11 are guided so that they converge to define therebetween a formingzone 30 of generally triangular section open at its larger end to thegap 31 between the breast rolls to receive stock from the headbox 33,which is represented diagrammatically and is preferably of theconstruction shown in application Ser. No. 703,299, now US. Pat. No.3,578,560. The wire reaches defining the forming zone are guided bydeflector assemblies 35 which engage the inner surfaces of these wirereaches in supporting relation, and which also serve to skim off waterexpressed through the wires and to guide this water away from the wires.The upper edge of a suction box 37 mounted below the lowermost of thedeflectors 35 within the loop of the carrying wire 13 also acts as adeflector, and the lowermost deflector within the loop of the backingwire 12 may be similarly combined with a suction box 38.

The spacing and arrangements of the deflectors 35 with respect to eachother and to the gap 3i above the forming zone are determined inaccordance with the principles described in application Ser. No.755,602, now U.S. Pat. No. 3,578,556, so that the stock is delivered asa sheet-like jet to the upper end of the forming zone by the headbox 33and impinges on the wires 1243 below the level at which the pumpingaction of the breast rolls Ell-l1 would tend to draw liquid through thewires, i.e., substantially below the line of tangency of each wire withits associated breast roll. The stock is progressively dewatered as ittravels downwardly with the forming wires until at the level of thesuction box 37, the major volume of free water has been expressedthrough the wires, and the fibers remaining between the wires have beencompacted and felted into a mat or sheet which provides a bridgingstructure between the wires.

After the two wires with the sheet therebetween pass the suction box 37,they partially wrap the turning roll 15 and proceed laterally toward thesuction roll 20. Just beyond the roll 15, there is located afixedsuction box 40 over which the two wires pass, but the turning roll 16for the backing wire 12 is so located beyond the suction box 40 as tocause wire 22 to diverge from wire 13 as the two wires pass across thesuction box 4G. The action of the suction box 4% will therefore hold thesheet on the generally horizontal run of the conveying wire 13 whilewire 12 diverges therefrom toward its turning roll 16.

The sheet travels beyond suction box 40 on the upper surface of thehorizontal run of wire 13 toward the suction roll 20, and additionalsuction boxes 41 may be located between suction box MB and roll 2% ifdesired. A suction pickup roll 44 and cooperating felt 45 are located topick the sheet up from wire 13 as it travels from roll 20 to roll 21,this arrangement being essen tially the same as a conventional suctionpickup from a Fourdrinier machine having a suction couch roll and a wiredrive roll in the positions of rolls 2021.

The invention is especially concerned with the provision of supportingstructure for the operative parts of the paper forming section asoutlined above which will contribute to the simplicity of theconstruction, mounting and maintenance of the deflectors 35, and whichwill also contribute to the ease of changing the forming wires. As iscustomary, the fixed base structure is per' manently mounted at the backside of the machine. it includes sole plates and the overhead frameworkcomprising vertical beams 51 and 52 and the longitudinal beams 53 whichsupport the headbox 33. Cantilever beams 55, 56 and 57 are alsopermanently mounted at the back of the machine, and the usual removableblocks are provided to support the front ends of these beams, asindicated by such blocks 58.

The main support for the breast roll 11 and its associated deflectorassemblies 35 is an essentially unitary frame member 60 of generallytub-like structure so that it also forms the receptacle for the liquidremoved by the deflectors which engage the wire 13. Baffles ell extendthe full width of the machine internally of the member 61 and act bothas reinforcing ribs and to guide the liquid received from the deflectors35. This accumulated liquid may be removed at the machine by anyconvenient piping from the discharge outlet indicated at 62. The framemember 641 also forms the support for the turning roll 23 and guide roll24.

The frame member 60 is mounted on the fixed base structure by a pivotedmounting 65 on brackets 66 which extend from the ends of the side rails67 of the main frame. The frame member so is movable on this pivotalmounting between its generally vertical operative position shown in HG.1 and its generally horizontal retracted position shown in FIG. 2. Meansfor ef fectin g this movement are shown as comprising one of a pair ofcables 7% running from a reel (not shown) around pulleys 71 on thestationary framework and over a pair of capstans '72 at opposite sidesof the frame member 66 to fixed points of attachment 73.

The main support for the breast roll ill and its associated deflectors35 is a second essentially unitary frame member which also serves as thesupport for the couch roll 12. The frame member 50 is similarly oftub-like structure and includes interior reinforcing ribs or baffles 81and a discharge outlet 82 at the back side of the machine. The framemember 80 is provided with a pivotal mounting 85 on the cantilever beam55, and a screw jack 88 connected between the beam 55 and member 80causes controlled movement of member 80 about pivot 85 between itsgenerally vertical operating position shown in FIG. 1 and the retractedposition shown in FlG. 2 for changing of the wire 12.

A third frame member 911 shares the pivotal mounting 85 with its framemember 60 and forms the main support for the other supporting rollswithin the loop of wire 12, such as the rolls 16-17. Movement of framemember 90 on pivot 85 is primarily for controlling the tension of wire12 as well as for wire changing, and such movement is effected andcontrolled by means such as a bellows diaphragm 91 connected between thebeam 55 and member 90 through a bracket 92. The wire guide roll 17 isshown as mounted on the upper end of member 90 by a lever arm 93 pivotedon member 90 at 94 and controlled by a pressure diaphragm 95, which maybe actuated in any conventional way to move one end of roll 17 asrequired to maintain the wire 12 running straight.

It will be apparent that the vertical alignment and configuration of theforming zone 31) are determined by the operative positions of the framemembers 60 and 80. Accordingly, the operative position of the framemember 80 is preferably fixed by means such as an adjustable stop nut inthe screw jack 88. The operative position of the frame member 61) isthen similarly readily established by means such as the latch mechanism100 for locking the two frame members 60 and 80 together, preferably atboth the front and back of the machine. Adjustable stop nuts 101 on thislatch mechanism provide for adjustment of the operative position of theframe member 60.

In accordance with the invention, the frame members 60 and 80 areconstructed to contribute major advantages of strength and rigidity tothe deflectors 35 and their mountings, together with significantadvantages of ease of maintenance and replacement of deflectorassemblies. Another advantage derived from these structural features isthe ability to establish the forming zone with its length very short inthe direction of wire travel even in a very wide paper machine, withresulting convenience and economy of over-all construction. Since theframe members 611 and 80 are of generally the same basic constructionfrom the standpoint of these features, the details of only frame member611 are shown in the drawings.

Referring to FIG. 3, the frame member 60 is preferably constructed as aunitized weldment, composed of end walls 110 connected by the back wall111 and the baffles or reinforcing ribs 61. Additional reinforcement isprovided by multiple ribs 112 arranged parallel with the direction ofwire travel at appropriately spaced positions across the width of themachine. Also a walkway 115 may advantageously be provided, preferablyby a permanent mounting, to extend between the end walls 110 at aposition between the suction box 37 and the pivotal mounting 65 for usein the horizontal position of member 60.

The construction of the frame member 60, and similarly of the framemember 80, provides a very strong and rigid base mounting for anysuitable deflector, and FIGS. 5-6 show a preferred construction ofdeflector assembly which includes a deflector blade 120 of any material,such as Micarta, found satisfactory for the purpose. The main supportfor the blade 1211 is a bar 121 of obtuse angular section such that theleg 121a which supports the blade 120 will extend in generally thedesired angular relation with the direction of wire travel therepast.The other leg 121b is rigidly secured to the frame member 120, forexample by bolting at its ends to the end walls as indicated at 122. Inaddition, this leg 121b is preferably secured for further bracing to theadjacent edge of each of the reinforcing ribs 112, as indicated by thebracket assemblies 123.

Provision is also made for effecting some angular adjustment of the legs121a and 121b for corresponding adjustment of the angular relation ofthe associated blade with the adjacent portion of the wire. A slot 124at the junction of the two legs of bar 121 provides for resilientmovement of leg 121a with respect to leg 121b. A smaller bar 125complementary in section to bar 121 has its upper leg welded orotherwise secured to the leg 121a, and its other leg depends in spacedrelation with the leg 12%. A series of jack screws 127 are threaded intothe leg 121b, and each of these jack screws has a conical point 128engaging a conical recess in the opposed face of the bar 125. Means areprovided for rotating all of the jack screws 127 together, such as thepulley 130 on each screw 127 and cable 131 forming a driving connectionbetween all of the pulleys 130 which is accessible from one end of bar121, so that as the jack screws are threaded out of the bar leg 121b,they will thrust the bar 124 in clockwise direction in FIG. 5 andthereby cause the bar leg 12111 to move upwardly against its naturalresilience and the downward load applied thereon by the engagement ofthe associated wire and deflector blade 120.

Provision is made for mounting the blade 1211 on the bar 121 in suchmanner that it can be moved toward and away from the wire while themachine is running. A plate 134 is welded or otherwise secured on top ofthe leg 121a and projects beyond the outer edge of this leg toward thewire. The blade support body 135 has its forward edge shaped to aresilient hook 136 which engages over the projecting edge of the plate134. A plurality of links 140 have their forward ends pivoted at 133 tothe bar leg 121a, and their rearward ends are pivoted at 141 to therearward portion of the blade support body 135 so that swinging movementof these links .will cause the body 135 to move on the plate 13 towardand away from the adjacent forming wire.

The deflector blade 1211 is retained on the support body 135 by anelongated clamp 1441 having a hooked forward edge 145 for engaging acomplementary groove in the upper surface of the blade 120. The clamp144 is secured by a row of screws 1416 to a bar 147 welded on the body135. A similar bar 1418 is also welded on body 135 in spaced relationwith bar 147 to form therewith a space receiving a resilient tube 149connected to a source of pressure air. When pressure is applied to thistube, it will expand sufficiently to tilt the clamp 144 incounterclockwise direction as viewed in MG. 5 and thereby to cause theforward edge of clamp 144 to force the deflector blade 1211 against thesupport body 135. When the .air pressure is released, the blade 1211 iseasily withdrawn lengthwise and similarly replaced.

it will be seen that this deflector assembly will make it possible tomove the deflector blade 12@ toward and away from the associated formingwire by moving the blade support body 135 through swinging movement ofthe links 140. This movement can be accomplished while the machine isrunning by the push-pull drive shown in FIG. 5. A link i156 is pivotedto one end of the body 135, and its other end is pivotally connected toa screw 151 threaded through bracket i152 mounted on the end of the barleg 121a for access from outside the machine. Threaded movement of thescrew 151 will produce the desired movement of the deflector assembly,which can be locked in any desired position by the lock nuts 153 onscrew 151. The part 155 in FIG. is a shield of sheet metal or the likefor deflecting spray and other free water.

The construction of the frame member 80 and the arrangement for mountingthe deflector assemblies which it carries are essentially the same asdescribed for the frame member 60, the only differences between thesetwo frame members being in over-all configuration and dimensions asdictated by the different functions which they perform in the machine.The construction of the deflector assemblies and their cooperativerelation with the over-all structure of the frame members 60 and 80provide significant practical advantages. In particular, the mountingbars 121 and 125 are readily made of sufflciently heavy stock to producesubstantial inherent rigidity, and they are further braced and stiffenedby their connections to the walls and reinforcing ribs of the associatedframe member. It is therefore not necessary to design rigidity andresistance to deflection into the deflector blades or their associatedparts in each deflector assembly, and this in turn makes it possible toconstruct each deflector assembly with a relatively short dimension inthe direction of wire travel. Width of the paper machine is also not afactor in establishing this dimension, and it is therefore possible evenin a very wide machine to utilize a total of eight individual deflectorsas shown in FIG. I and still to keep the over all length of the formingzone as short as approximately four feet.

It is also a significant advantage provided by the invention that whenthe frame member 60 is in its retracted position shown in FIG. 2 and thewires are removed, the working surface of the entire set of deflectorassemblies on each of the frame members 50 and 80 is readily availablefor inspection, and for replacement or other servicing of the individualdeflector assemblies as may be necessary, such for example as adding,removing, or changing the spacing of deflector assemblies by unboltingand/or bolting the appropriate bars 123. The walkway E E5 contributes tothis advantage in the horizontal retracted position of the member an byproviding access for maintenance personnel to both sets of deflectorassemblies, since with the forming zone dimensioned as just described, aman standing on the walkway US can easily reach any of the deflectorassemblies on the frame member 84]! while also easily reaching any ofthose on the frame member on. On the other hand, if the deflectorassemblies require no ser vicing at the time of a wire change, it is afeature of the invention that the entire set of deflector assemblies foreach wire will remain in fixed relation with each other and with theassociated breast roll throughout the en tire wire changing procedure.

As already noted, FIG. 2 shows the forming members as and 80 in theirrespective positions for the changing of both wires, and it alsoillustrates wire changing apparatus designed for use with this papermachine. The wire stringing apparatus for the conveying wire 13comprises only two main components, namely a pair of frames 60 and 161shown in FIG. 3 in their storage po sition in which they may be nestedtogether along with the wire-carrying poles 162 and the coiled new wire163. In use, the two frames and 161 are stationed sufficiently apart sothat they can be moved laterally of the machine past the turning roll 2iand the breast roll 11 in its lowered position. Prior to this movement,the wire is strung as shown in FIG. 2 on the poles H62, and the entireassembly is then moved to locate the wire on the machine in the usualway for a Fourdrinier paper machine as represented in FIG. 2.

The wire changing apparatus for the backing wire 12 comprises agenerally A-shaped frame having a cross brace 171 at its front end andhaving mountings 172 at its rear end for support on tracks 1'73suspended from the longitudinal beams 53. The frame 170 is constructedto carry the usual removable poles 175, and with the wire strung thereonwhile the frame is in the aisle in front of the machine, it can then bemoved Iaterally to drape the wire over the four rolls 10, t2, t6 and l7.It will be understood that for changing operations, the appropriateblocks 58 at the front side of the machine are removed to leave thenecessary section or sections of the machine supported by cantileverbeams are required to provide space for receiving the wires.

In addition to the other advantages offered by the invention asdescribed above, it should be noted that it provides a two-wire papermachine construction which is especially well adapted for use inconverting an existing Fourdrinier machine to two-wire operation. Thusthe base and frame structure may comprise the corresponding portion atthe dry end of a Fourdrinier section, the roll 20 may be the suctioncouch roll of a Fourdrinier machine, and the rolls 2], 22 and 24 may besimilarly adapted from an existing machine along with the suction boxes40 and 41. The forming zone in accordance with the invention can be soshort that even in the retracted position of the frame member 60, thebreast roll Ill will be closer to the roll 20 than the breast roll ofthe corresponding Fourdrinier section, and this is a substantial savingin space requirements while still providing ample space for thenecessary movement of the frame member 6%.

FIG. 7 illustrates diagrammatically the application of the invention toa vertical two-wire paper machine utilizing a pair of couch or turningrolls similarly to the machines disclosed in some of the above notedpatents and applications. The arrangement of parts for supporting andguiding the backing wire 12 are essentially the same in construction andarrangement as in FIG. 2, and they have accordingly been identified asl0, l2 and so forth. Some of the parts for supporting and guiding theconveying wire 13' are similarly of the same construction andarrangement as in FIG. 1, and they also have been identified as M, 25'and so forth. The additional couch roll X86 for the conveying wire 13'is a suction roll mounted below the breast roll 11 and at a level belowthat of the turning roll l5, and a pickup roll K81 and pickup felt R82are arranged to pick up the sheet from the reach of wire 13' betweencouch roll will and the adjacent turning roll 185.

As illustrated by dotted lines in FIG. 7, the frame member 6% can pivotabout its pivotal mounting 65 to a retracted horizontal positionessentially the same as that of the frame member 60 in FIG. 2. This isthe position for wire changing, and it will be understood that the couchroll 180 will have a cantilevered mounting at the front side of themachine in the usual way. It will be apparent that in the retractedposition of the frame member 60, the working surfaces of the deflectorson each of the frame members 60' and 80' will be exposed for readyaccess for the purposes already described. It will also be understoodthat the wire 13 can be guided in many other patterns by suitablylocated rolls without the loss of any of the advantages of theinvention.

FIG. 8 shows the application of the invention to a two-wire verticalpaper machine wherein the wires are arranged to travel upwardly as theydefine the forming zone, substantially as shown in the above applicationSer. No. 771,888, now U.S. Pat. No. 3,597,315. The breast rolls 200 and201 are each provided with an associated turning or couch roll 202 and203, and the wires 204 and 205 travel upwardly from the breast rolls tothe couch rolls in converging relation defining the forming zone 210which receives stock jetted upwardly from the headbox 212 as describedin application Ser. No. 771,888. The arrangement of deflectors 215 issimilar to that shown in FIG. 1 except that the lower surface of eachdeflector is inclined upwardly away from the adjacent inner surface ofthe associated wire, and the uppermost deflector for the conveying wire205 is combined with a suction box 217 to assure that the sheet adhereto the wire 205 as it wraps the couch roll 203, which is shown as asuction roll mounted by a bracket or support means 203a and having asuction box 218 for additional dewatering of the sheet. The suctionpickup roll 220 and felt 221 pick up the sheet from the wire run betweenthe rolls 222 and 223.

The suction couch roll 203 and the deflectors 215 for the conveying wireare mounted on a frame member 225 which has essentially the samestructural features as the frame member 60 but may be of somewhatdifferent overall dimensions and configuration as may be required, suchas the internal reinforcing baffles 226. The frame member 225 isprovided with a pivotal mounting 228 on which it can be moved to asubstantially horizontal retracted position, represented by the dottedline showing of the couch roll 203, for wire changing and servicing ofthe deflectors. The frame member 230 which carries the couch roll 202and the associated deflectors 215 is of essentially the same basicconstruction as the frame members 80 and 225, as well as of very similarconfiguration. The operation of these parts correspond to those of thesimilar parts already described, and the same advantages are provided bythe cooperative supporting and bracing action of each of the framemembers with respect to the deflectors carried thereby as well as withrespect to the ease of servicing of the deflectors when the framemembers are in their retracted positions.

It will be apparent that while the invention has been described inconnection with twin-wire paper machines wherein the length of theforming zone is substantially vertical, this is not a limitation on theuse of the invention. n the contrary, the principles of the inventioncan be applied to twin-wire paper machines wherein the length of theforming zone extends in any direction between horizontal and vertical,as is easily visualized by considering any of the illustrated papermachines with the drawing turned through 90, in which event thearrangement would preferably be such that the movement of the upperframe member would be through substantially so that the lower framemember would be in exposed horizontal position afiording access to theworking surfaces of both guide means in substantially the same manner asshown in FIG. 2. It is also not essential that it be the frame memberassociated with the conveying wire which is movable through 90, but thisis usually the case as a matter of convenience because it is usually theconveying wire which is the longer of the two wires and thereforeprovides the greater space in which the associated frame member can movewithout interference with fixed wire rolls.

While the forms of apparatus herein described constitute preferredembodiments of the invention, it is to be understood that the inventionis not limited to these precise forms of apparatus, and that changes maybe made therein without departing from the scope of the invention.

What is claimed is:

1. Apparatus for forming a paper sheet between a pair of looped formingwires and including a base structure, a pair of breast rolls cooperatingto support a pair of reaches of said wires in opposed relation defininga generally vertically extending forming zone having a mouth forreceiving paper making stock therethrough, a turning roll located at theopposite end of said fonning zone from said mouth, guide means arrangedwithin the loop of each of said wires to engage and guide said reachesin generally vertically converging relation from the respective saidbreast rolls to said turning roll and thereby to cause said wires toexert pressure on stock within said fonning zone forcing the liquidtherein to be extruded through said wires while the fibers remainingtherein form a paper sheet, guide roll means positioned within the loopof each of said wires to cause said wires to wrap an angular portion ofsaid turning roll and thereafter to separate from each other, and meansfor causing said sheet to adhere to one of said wires as the other saidwire diverges therefrom said apparatus further comprising:

a. an essentially unitary first frame member located within the loop ofone of said wires and forming the common support for said guide meanswithin said wire loop and for one of said breast rolls,

b. a second frame member located within the loop of the other of saidwires and forming the common support for said guide means within saidother wire loop and for the other of said breast rolls,

c. means forming a pivotal mounting on said base structure for saidflrstframe member having its axis parallel with said rolls,

d. means supporting said turning roll in predetermined spaced relationwith said pivotal mounting,

e. means for causing pivotal movement of said first frame member aboutsaid pivotal mounting be-' tween the operating position thereof whereinsaid rolls and guide means support said one wire in operative relationwith said other wire and a position retracted from said operatingposition providing ready access to the space between said guide meansand thereby to the wire engaging surfaces of both of said guide means,and

said predetermined spaced relation between said pivotal mounting andsaidturning roll being such that movement of said frame member to saidretracted position unwraps said one wire from said turning roll andthereby provides sufficient slack for changing said wire.

2. Apparatus as defined in claim 1 wherein said breast rolls and saidguide means support said wire reaches in downwardly converging relationwith said mouth located at the upper end of said forming zone to receivestock therethrough from above, wherein said supporting means supportsaid turning roll on said second frame member, and wherein said pivotalmounting is positioned to locate the axis thereof at a level below thelevel of said turning roll.

3. Apparatus as defined in claim 2 further comprising means establishinga substantially vertical operative position for said first frame memberand a substantially horizontal retracted position therefor with saidguide means thereon facing upwardly.

4. Apparatus as defined in claim 1 wherein said breast rolls and saidguide means support said wire reaches in upwardly converging relationwith said mouth located at the lower end of said forming zone to receivestock therethrough from below, wherein said supporting means supportsaid turning roll adjacent the top of said first frame member, andwherein said pivotal mounting is positioned to locate the axis thereofadjacent the lower end of said first frame member.

5. Apparatus as defined in claim 4 further comprising means establishinga substantially vertical operative position for said first frame memberand a substantially horizontal retracted position therefor with saidguide means thereon facing upwardly.

6. Apparatus as defined in claim 4 wherein said turning roll is asuction roll having a suction box located in the portion thereof wrappedby said wires.

7. Apparatus as defined in claim 1 wherein said guide means include aplurality of individual deflector assemblies each including a deflectorblade for engaging the inner surface of the associated said wire toremove the extruded liquid therefrom, and wherein said first framemember includes internal reinforcing means cooperating with saiddeflector assemblies to support and brace said deflector blades againstdeflection.

8. Apparatus as defined in claim 7 wherein said first frame memberincludes at least one internal rib extending generally parallel with thelength of said forming zone and spaced from the ends of said formingzone, and wherein each said deflector assembly includes a bar extendingsubstantially the full width of said forming zone, and furthercomprising means securing said bar to each said rib and to opposite endportions of said said frame member.

9. Apparatus as defined in claim 8 wherein said securing means areaccessible from the wire engaging surfaces of said guide means when theassociated wire is removed to facilitate servicing of said deflectorassemblies.

10. Apparatus as defined in claim 1 wherein said guide means include aplurality of deflector blades for engaging the inner surfaces of theassociated said wires to remove the extruded liquid therefrom,supporting means for said deflector blades including a substantiallyrigid bar for each said deflector, reinforcing means for supporting saidbar in rigidly braced relation with said frame member, and means formingremovable connections between each said bar and said frame members atlocations accessible from the working surface of said guide members inthe retracted position of said first frame member when the associatedsaid wire is removed.

11. Apparatus as defined in claim 1 further comprising a walkway securedon said first frame member at a location below the level of said guidemeans mounted thereon, and means establishing a substantial verticallyoperative position for said frame member and a retracted positiontherefore wherein said walkway is substantially horizontal to facilitateaccess to all of said guide means in said retracted position of saidframe member,

1. Apparatus for forming a paper sheet between a pair of looped formingwires and including a base structure, a pair of breast rolls cooperatingto support a pair of reaches of said wires in opposed relation defininga generally vertically extending forming zone having a mouth forreceiving paper making stock therethrough, a turning roll located at theopposite end of said forming zone from said mouth, guide means arrangedwithin the loop of each of said wires to engage and guide said reachesin generally vertically converging relation from the respective saidbreast rolls to said turning roll and thereby to cause said wires toexert pressure on stock within said forming zone forcing the liquidtherein to be extruded through said wires while the fibers remainingtherein form a paper sheet, guide roll means positioned within the loopof each of said wires to cause said wires to wrap an angular portion ofsaid turning roll and thereafter to separate from each other, and meansfor causing said sheet to adhere to one of said wires as the other saidwire diverges therefrom said apparatus further comprising: a. anessentially unitary first frame member located within the loop of one ofsaid wires and forming the common support for said guide means withinsaid wire loop and for one of said breast rolls, b. a second framemember located within the loop of the other of said wires and formingthe common support for said guide means within said other wire loop andfor the other of said breast rolls, c. means forming a pivotal mountingon said base structure for said first frame member having its axisparallel with said rolls, d. means supporting said turning roll inpredetermined spaced relation with said pivotal mounting, e. means forcausing pivotal movement of said first frame member about said pivotalmounting between the operating position thereof wherein said rolls andguide means support said one wire in operative relation with said otherwire and a position retracted from said operating position providingready access to the space between said guide means and thereby to thewire engaging surfaces of both of said guide means, and f. saidpredetermined spaced relation between sAid pivotal mounting and saidturning roll being such that movement of said frame member to saidretracted position unwraps said one wire from said turning roll andthereby provides sufficient slack for changing said wire.
 2. Apparatusas defined in claim 1 wherein said breast rolls and said guide meanssupport said wire reaches in downwardly converging relation with saidmouth located at the upper end of said forming zone to receive stocktherethrough from above, wherein said supporting means support saidturning roll on said second frame member, and wherein said pivotalmounting is positioned to locate the axis thereof at a level below thelevel of said turning roll.
 3. Apparatus as defined in claim 2 furthercomprising means establishing a substantially vertical operativeposition for said first frame member and a substantially horizontalretracted position therefor with said guide means thereon facingupwardly.
 4. Apparatus as defined in claim 1 wherein said breast rollsand said guide means support said wire reaches in upwardly convergingrelation with said mouth located at the lower end of said forming zoneto receive stock therethrough from below, wherein said supporting meanssupport said turning roll adjacent the top of said first frame member,and wherein said pivotal mounting is positioned to locate the axisthereof adjacent the lower end of said first frame member.
 5. Apparatusas defined in claim 4 further comprising means establishing asubstantially vertical operative position for said first frame memberand a substantially horizontal retracted position therefor with saidguide means thereon facing upwardly.
 6. Apparatus as defined in claim 4wherein said turning roll is a suction roll having a suction box locatedin the portion thereof wrapped by said wires.
 7. Apparatus as defined inclaim 1 wherein said guide means include a plurality of individualdeflector assemblies each including a deflector blade for engaging theinner surface of the associated said wire to remove the extruded liquidtherefrom, and wherein said first frame member includes internalreinforcing means cooperating with said deflector assemblies to supportand brace said deflector blades against deflection.
 8. Apparatus asdefined in claim 7 wherein said first frame member includes at least oneinternal rib extending generally parallel with the length of saidforming zone and spaced from the ends of said forming zone, and whereineach said deflector assembly includes a bar extending substantially thefull width of said forming zone, and further comprising means securingsaid bar to each said rib and to opposite end portions of said saidframe member.
 9. Apparatus as defined in claim 8 wherein said securingmeans are accessible from the wire engaging surfaces of said guide meanswhen the associated wire is removed to facilitate servicing of saiddeflector assemblies.
 10. Apparatus as defined in claim 1 wherein saidguide means include a plurality of deflector blades for engaging theinner surfaces of the associated said wires to remove the extrudedliquid therefrom, supporting means for said deflector blades including asubstantially rigid bar for each said deflector, reinforcing means forsupporting said bar in rigidly braced relation with said frame member,and means forming removable connections between each said bar and saidframe members at locations accessible from the working surface of saidguide members in the retracted position of said first frame member whenthe associated said wire is removed.
 11. Apparatus as defined in claim 1further comprising a walkway secured on said first frame member at alocation below the level of said guide means mounted thereon, and meansestablishing a substantial vertically operative position for said framemember and a retracted position therefore wherein said walkway issubstantially horizontal to facilitate access to all of said guide meansin said retracted position of said frame member.